We bombarded aluminum with alpha rays ... then after a certain period of irradiation, we removed the source of alpha rays. We now observed that the sheet of aluminum continued to emit positive electrons over a period of several minutes. (Frederic Joliot-Curie)

We bombarded aluminum with alpha rays ... then after a certain period of irradiation, we removed the source of alpha rays. We now observed that the sheet of aluminum continued to emit positive electrons over a period of several minutes.

Frederic Joliot-Curie

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alpha aluminum certain continued irradiation now period positive several sheet source minutes

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